I don't think you really need to append "of the <time-interval>", but I agree. Maybe he can explore why Apple prefers a closed ecosystem to an open one, and write about that. Is it because it's better for their customers? Because if not then it fucking sucks and he should be ashamed of himself for being such a tireless defender of it.

Also, yeah, about "tax". It's used pretty loosely sometimes, John. Like when mobsters talk about protection money. Welcome to language.